Where We Are Working

There are 487 onshore oil and gas fields in California; these were classified as high, medium, and low priority for detailed study as part of the COGG program based on the intensity of petroleum resource development and proximity to groundwater resources (Davis and others, 2018). Each year, a new set of high priority fields is selected based on feedback from the State Water Board and Regional Boards. The map shows what kind of work has been done in which fields to date.